122001220421 has 2 divisors, whose sum is σ = 122001220422. Its totient is φ = 122001220420.

The previous prime is 122001220417. The next prime is 122001220423. The reversal of 122001220421 is 124022100221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85629390625 + 36371829796 = 292625^2 + 190714^2 .

It is a cyclic number.

It is not a de Polignac number, because 122001220421 - 2² = 122001220417 is a prime.

Together with 122001220423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122001220421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122001220423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61000610210 + 61000610211.

It is an arithmetic number, because the mean of its divisors is an integer number (61000610211).

Almost surely, 2^122001220421 is an apocalyptic number.

It is an amenable number.

122001220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

122001220421 is an equidigital number, since it uses as much as digits as its factorization.

122001220421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 122001220421 its reverse (124022100221), we get a palindrome (246023320642).

The spelling of 122001220421 in words is "one hundred twenty-two billion, one million, two hundred twenty thousand, four hundred twenty-one".